Mix marinade ingredients and pour over chicken in a Ziploc bag. Marinate for at least 2 hours in refrigerator.
In a small bowl, mix Greek yogurt and juice from 1/2 of a lime. Set aside in refrigerator.
Cook quinoa according to package directions. Mix in remaining lime juice and 2 tbsp chopped cilantro. Set aside.
While quinoa is cooking, grill chicken breast until cooked through (mine took about 10 minutes at 375 degrees on my George Foreman).
Layer quinoa, lettuce, tomatoes, corn, pickled red onion, remaining cilantro and chicken in a bowl. Top with lime/yogurt dressing and serve. Add avocado if desired (not included in nutrition info).